This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A240161 #14 Aug 05 2014 02:34:40 %S A240161 4,5,7,8,12,13,15,16,25,31,33,34,35,39,42,55,65,66,77,78,85,95,102, %T A240161 105,110,114,121,130,133,136,138,152,156,167,169,170,186,187,203,204, %U A240161 221,222,232,246,248,253,255,259,279,282,290,294,296,301,318,322,325,328,329,333,354,366 %N A240161 Numbers n such that (k!-n)/k is prime for some k. %C A240161 Numbers n such that A240160(n) is not null. - _Michel Marcus_, Aug 05 2014 %H A240161 Jens Kruse Andersen, <a href="/A240161/b240161.txt">Table of n, a(n) for n = 1..300</a> %o A240161 (PARI) %o A240161 a(n)=for(k=1,n,s=(k!-n)/k;if(floor(s)==s,if(ispseudoprime(s),return(k)))) %o A240161 n=1;while(n<500,if(a(n),print1(n,", "));n++) %Y A240161 Cf. A240160, A240163. %K A240161 nonn %O A240161 1,1 %A A240161 _Derek Orr_, Aug 01 2014